1320322320 has 60 divisors (see below), whose sum is σ = 4434084876. Its totient is φ = 352085760.

The previous prime is 1320322253. The next prime is 1320322343. The reversal of 1320322320 is 232230231.

It is a happy number.

1320322320 is a `hidden beast` number, since 1 + 3 + 20 + 322 + 320 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 470716416 + 849605904 = 21696^2 + 29148^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1320322293 and 1320322302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 916171 + ... + 917610.

Almost surely, 2^1320322320 is an apocalyptic number.

1320322320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1320322320 is an abundant number, since it is smaller than the sum of its proper divisors (3113762556).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1320322320 is a wasteful number, since it uses less digits than its factorization.

1320322320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1833800 (or 1833791 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 1320322320 is about 36336.2397614283. The cubic root of 1320322320 is about 1097.0505892226.

Adding to 1320322320 its reverse (232230231), we get a palindrome (1552552551).

The spelling of 1320322320 in words is "one billion, three hundred twenty million, three hundred twenty-two thousand, three hundred twenty".